ABC
noun [singular] (British English)(North American English also ABCs [plural], ABC’s [plural])
Idioms all the letters of the alphabet, especially as they are learnt by children 字母表（尤指儿童学习的全部字母） the basic facts about a subject （某学科的）基础知识，入门 the ABC of gardening 园艺入门
Idioms
as easy as anything/as pie/as ABC/as falling off a log
- (informal)
very easy or very easily 十分容易；极容易；轻而易举 The whole procedure is as easy as ABC. 整个程序和ABC一样简单。 Fooling him was as easy as falling off a log. 愚弄他就像从木头上掉下来一样容易。